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SubjectRe: [PATCH -mm 5/7] add user namespace
Dave Hansen <> writes:

> On Thu, 2006-07-13 at 21:45 -0600, Eric W. Biederman wrote:
>> I think for filesystems like /proc and /sys that there will normally
>> be problems. However many of those problems can be rationalized away
>> as a reasonable optimization, or are not immediately apparent.
> Could you talk about some of these problems?

Already mentioned but. rw permissions on sensitive files are for
uid == 0. No capability checks are performed.

>> Passing a file descriptor between process in a unix domain socket is
>> a case where I can easily construct scenarios where there are
>> indisputable problems. It is one of my standard thought experiments
>> to see if a namespace is sound.
> Care to share some of those indisputable problems?

Already done.

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